My experience with black locust is not good, to say the least. I'm a third generation tree farmer in Missouri. My dad planted some gullied areas to black locust in the early 1950s at the recommendation of USDA. The gullies have healed but the trees keep spreading. Killing them is very, very hard and takes lots of chemicals, which I don't enjoy using. They've now spread into adjacent fields and are a pest but at least I can control them there. (They are HARD on tires, don't let anyone tell you otherwise) I can't seem to stop their slow and steady spread into adjacent timberland and they slowly choke out my oaks, walnuts and black cherries. I truly wish they'd never been planted but the genie is out of the bottle. To say they're not worth it is an understatement.
